HAZEL PARK - Police credit an alert resident with helping them catch a brother and sister from Detroit suspected of robbing store customers at gunpoint and trying to carjack a U.S Post Office vehicle to getaway Wednesday morning.

The resident saw the suspects inside a car, acting suspiciously outside the Family Dollar store at 24148 John R near Annabelle, police said.

The resident drove off as he saw the pair go into the store.

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"He followed his instincts and reported what he saw to police," said Hazel Park Police Chief David Niedmeier. "As we were arriving to check on the suspicious activity, the robbers were running out the door (of the store), with police hot on their tails."

Several customers inside the store were robbed.

One of the suspects was caught right away and the other was arrested in a nearby neighborhood later, police said.